Skewed shutdown 98

Hi people, I installed Norton System Works 2002 (which includes NAV), after uninstalling NAV 2001. I ran the Disk Doctor after rebooting and noting the shut down screen was completely out of phase. Where it normally reads "wait while windows shuts down" etc, then "it is now safe to turn off the computer", now shows only something unreadable which looks like the colors are bled (stretched) into lines of black and orange. The Disk Doctor found errors in the registry, which it fixed, but the shut down screen remains the same. Any thoughts? <img src=/S/shrug.gif border=0 alt=shrug width=39 height=15>